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BACKGROUND (Details)
12 Months Ended
Aug. 01, 2019
$ / shares
shares
May 30, 2019
$ / shares
shares
Jun. 04, 2018
$ / shares
shares
Apr. 05, 2018
shares
Mar. 12, 2018
shares
Nov. 03, 2017
shares
Oct. 25, 2017
shares
Aug. 19, 2015
class_of_stock
Mar. 31, 2020
USD ($)
segment
$ / shares
shares
Mar. 31, 2019
USD ($)
$ / shares
shares
Mar. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2019
Mar. 31, 2017
shares
Nov. 30, 2015
USD ($)
Aug. 18, 2015
vote
Class of Stock [Line Items]                              
Number of classes of common stock | class_of_stock               2              
Conversion ratio of common stock                             1
Professional fees | $                 $ 21,704,000 $ 23,035,000 $ 17,117,000        
Treasury stock acquired, average cost per share (in dollars per share) | $ / shares                 $ 44.13 $ 46.71 $ 35.17        
Number of business segments | segment                 3            
IPO | Restricted Stock                              
Class of Stock [Line Items]                              
Vesting period, restricted stock                 4 years 6 months            
Follow-on Offering                              
Class of Stock [Line Items]                              
Professional fees | $                 $ 0 $ 498,000          
Follow-on Offering And Forward Share Purchase Agreement                              
Class of Stock [Line Items]                              
Professional fees | $                 $ 0 $ 0 $ 2,084,000        
Class A                              
Class of Stock [Line Items]                              
Common stock voting rights, number of votes per share | vote                             1
Number of common shares outstanding (in shares)                 46,178,633 38,200,802          
Shares issued and sold in Follow-on Offering (in shares)         2,000,000,000 125,000 1,750,000                
Stock Repurchased and Retired During Period, Shares                 671,187 1,481,114 430,237        
Treasury stock acquired, average cost per share (in dollars per share) | $ / shares     $ 49.11                        
Class A | Follow-on Offering                              
Class of Stock [Line Items]                              
Selling price per share (in dollars per share) | $ / shares     $ 49.15                        
Class B                              
Class of Stock [Line Items]                              
Common stock voting rights, number of votes per share | vote                             10
Number of common shares outstanding (in shares)                 19,345,277 27,197,734          
Stock Repurchased and Retired During Period, Shares                 654,994 36,958 811,635        
Common Stock | Class A                              
Class of Stock [Line Items]                              
Number of common shares outstanding (in shares)                 46,178,633 38,200,802 30,604,405   22,026,811    
Shares issued and sold in Follow-on Offering (in shares)                 9,145 6,570 5,589        
Common Stock | Class B                              
Class of Stock [Line Items]                              
Number of common shares outstanding (in shares)                 19,345,277 27,197,734 37,187,932   50,883,299    
Stock Repurchased and Retired During Period, Shares                   2,000,000 6,900,000        
ORIX USA Corporation | Class A                              
Class of Stock [Line Items]                              
Shares issued and sold in Follow-on Offering (in shares) 3,377,935 3,000,000                          
Selling price per share (in dollars per share) | $ / shares $ 45.62 $ 45.80                          
Stock repurchased during period (in shares)     697,000                        
ORIX USA Corporation | Class A | Follow-on Offering                              
Class of Stock [Line Items]                              
Shares issued and sold in Follow-on Offering (in shares)     1,985,983                        
ORIX USA Corporation | Class B                              
Class of Stock [Line Items]                              
Number of common shares outstanding (in shares)                   2,268,214          
Stock Repurchased and Retired During Period, Shares       2,000,000,000                      
HL Holders | Class B                              
Class of Stock [Line Items]                              
Number of common shares outstanding (in shares)                 19,345,277 24,929,520          
Director | Class A                              
Class of Stock [Line Items]                              
Shares issued and sold in Follow-on Offering (in shares)                 9,145 6,570          
Accounts Payable and Accrued Liabilities | IPO                              
Class of Stock [Line Items]                              
Vesting period, restricted stock                 4 years 6 months            
Selling Stockholders | Class A | Follow-on Offering                              
Class of Stock [Line Items]                              
Shares issued and sold in Follow-on Offering (in shares)     1,014,017                        
Forward Contracts | Forward Purchase Agreement                              
Class of Stock [Line Items]                              
Shares excluded from calculation of basic and diluted earnings per share (in shares)                   2,000,000,000          
ITALY | Leonardo                              
Class of Stock [Line Items]                              
Notes payable issued, dividend distribution | $                           $ 14,000,000.0  
Interest acquired in the investment banking operations of Leonardo in Italy (as a percent)                 51.00%     51.00%   49.00%